In facility design, construction, and commissioning, two documents establish the roadmap for a successful project: the Owner's Project Requirements (OPR) and the Basis of Design (BOD). Together, they form a strict check-and-balance system to ensure a building operates exactly as intended.
Core definitions
Owner's Project Requirements (OPR)
A functional document detailed by the project owner that specifies the operational goals, criteria, and expectations for the facility. It defines what the building systems must achieve from a business and user standpoint.
Basis of Design (BOD)
A technical narrative and data set compiled by the design engineering team. It explains how they intend to fulfill the OPR requirements, detailing applicable codes, system choices, technical assumptions, and calculation criteria.
Comparison matrix
| Document | Primary author | Core focus | Project role |
|---|---|---|---|
| OPR | Project Owner / CxA Support | Goals, performance metrics, constraints, and business targets. | The target benchmarking standard for project success. |
| BOD | Architects & Design Engineers | Technical solutions, calculations, design paths, and equipment selections. | The engineering blueprint translating goals into building physics. |
Side-by-side commissioning integration
Pre-construction alignment
The Commissioning Authority (CxA) reviews the BOD directly against the OPR to verify every functional expectation has a valid engineering mechanism before a single dollar is spent on equipment.
Functional Performance Tests (FPTs)
The Cx team combines the high-level targets of the OPR with the operational sequences in the BOD to generate real-world hardware verification procedures. They stress-test systems to ensure physical assets achieve the programmatic intent.
OPR & BOD Blueprint
Copy and use this framework structure to document project development alignment.
1. Owner's Project Requirements (OPR) Framework
1.1 Project Program & Objectives
[Insert structural vision, space utilization layouts, facility capacities, and operational schedules.]
1.2 Sustainability & Environmental Mandates
[Detail targeted certifications such as LEED/WELL, net-zero carbon rules, and energy performance metrics.]
1.3 Indoor Environmental Quality (IEQ) Targets
[Specify required temperature setpoints, humidity boundaries, acoustics parameters, and filtration goals.]
1.4 Facility Life Cycle & Maintainability Expectations
[Outline targeted equipment life expectancy, spatial footprint rules for tool access, and standard component types.]
1.5 Personnel Training & Operational Budgets
[Document training hours required for site technicians and cap targets for total annual utility consumption costs.]
2. Basis of Design (BOD) Framework
2.1 Governing Design Assumptions & Ambient Metrics
[Insert outdoor meteorological conditions, weather station reference baselines, and local occupant load numbers.]
2.2 Codes, Legal Regulations, and Local Ordinances
[Enumerate applicable building codes, energy codes, regional structural laws, and industrial standards like ASHRAE.]
2.3 Core Building Systems Layout & Architecture Descriptions
[Summarize architectural features, insulation parameters, HVAC configurations, water setups, and primary electrical distribution.]
2.4 Comprehensive Sequences of Operation (SoO)
[Provide deep step-by-step logic chains for physical controls, schedule triggers, setback thresholds, and failure safety routines.]
2.5 Engineering Calculations & Sizing Datasets
[Attach complete engineering equations, heat-load summaries, pressure profiles, wire sizes, and scheduled machinery capacities.]